<?php
$code='jskhd  fk f';
$code=<<<'qwedfsvx'
<?php
$s="123abc汉";
echo $s,"\n";
echo $s[0],$s[6],"\n";//字符串就是一个数组
echo 'I\'m a teacher\\student\n',"\n";
echo "He say:\"I'm a student\"\n";
qwedfsvx;
echo $code;//输出字符串中代码的内容
